Respiration

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Across
  1. 4. Respiration – Happens inside cells to release energy.
  2. 6. – The action of taking air into your body.
  3. 8. – All around us, invisible but essential.
  4. 9. – You do this every moment without thinking.
  5. 12. – You smell and breathe with it.
  6. 13. – The main breathing organs in your chest.
  7. 15. – What you do after inhaling.
Down
  1. 1. – Very tiny blood vessels wrapped around alveoli.
  2. 2. System – The body system that controls breathing.
  3. 3. – A tube in your throat that leads to your lungs.
  4. 5. – The muscle that moves up and down when you breathe.
  5. 7. – Plants give it off; humans breathe it in.
  6. 10. Exchange – Where oxygen goes in and carbon dioxide comes out.
  7. 11. – Tiny balloon-like sacs inside the lungs.
  8. 14. – Left and right air tubes inside your chest.